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Chapter 4 Infection and Immunity
Infection and Immunity
12
Pathology
Undergraduate 2
02/14/2011

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Term
infectious disease
Definition
when a microorganism produces a harmful and potentially lethal consequence
Term
Infection
Definition
presence and multiplication within another living organism
Term
colonization
Definition
the act of establishing a presence in the host
Term
Microflora
Definition
harmless bacteria that is present on the inside and outside surfaces
Term
commensalism
Definition
when the host is NOT affected by the microorganism
Term
commensal flora
Definition
the colonizing microbes that are not harmful to the host
Term
mutualism
Definition
when the host and microbe both BENEFIT from eachother
Term
Parasitic relationship
Definition
when the host does not gain benefits from the microbe or is harmed from it
Term
virulence
Definition
disease producing potential
Term
pathogens
Definition
microbes that rarely are found in the absence of disease
Term
saprophytes
Definition
free-living organisms that obtain their nutrients from dead or decaying organic material in the environment
Term
opportunistic pathogens
Definition
pathogens that are capable of producing an infectious disease when the health and immunity of the host have been weakened
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